/*
 * Dijjer - A Peer to Peer HTTP Cache
 * Copyright (C) 2004,2005 Change.Tv, Inc
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package dijjer.io.xfer;

import java.io.IOException;
import java.io.InputStream;
import dijjer.io.comm.RetrievalException;
import dijjer.util.Buffer;

/**
 * @author ian
 * 
 * To change the template for this generated type comment go to Window - Preferences - Java - Code Generation - Code and
 * Comments
 */
public class InputStreamBlockReceiver {

	PartiallyReceivedBlock _prb;
	InputStream _is;

	public InputStreamBlockReceiver(PartiallyReceivedBlock prb, InputStream is) {
		_prb = prb;
		_is = is;
	}

	public void start() throws IOException {
		try {
			for (int packet = 0; packet < _prb.getNumPackets(); packet++) {
				byte[] ret = new byte[_prb.getPacketSize()];
				int offset = 0;
				boolean eof = false; // If we reach the end of file then this will pad the rest of the block
												// with 0s
				if (!eof) {
					while (offset < ret.length) {
						int r = _is.read(ret, offset, ret.length - offset);
						if (r == -1) {
							eof = true;
							break;
						}
						offset += r;
					}
				}
				_prb.addPacket(packet, new Buffer(ret));
			}
		} catch (IOException e) {
			_prb.abort(RetrievalException.IO_ERROR, e.getMessage());
			throw e;
		}
	}
}
